package com.gulimall.cart.controller;

import com.gulimall.cart.service.CartService;
import com.gulimall.cart.vo.Cart;
import com.gulimall.cart.vo.CartItem;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.servlet.mvc.support.RedirectAttributes;

import java.util.List;
import java.util.concurrent.ExecutionException;

/**
 * @author djg
 * @date 2020/9/2
 * @des
 */
@Controller
public class CartController {

    @Autowired
    private CartService cartService;

    /**
     * 浏览器有一个cookie，user-key：标识用户身份，一个月后过期
     * 如果用户第一次使用jd的购物车功能，都会给一个临时的用户身份
     * 浏览器以后保存，每次访问都会带上这个cookie
     *
     * 登录状态：有session
     * 没登陆：按照cookie里面带来的user-key来做
     * 第一次打开购物车：如果没有临时用户，需要创建一个临时用户
     *
     * @return
     */
    @GetMapping("/cart.html")
    public String cartListPage(Model model) throws ExecutionException, InterruptedException {
        //1、快速获取用户信息，id，user-key，使用ThreadLocal
        Cart cart = cartService.getCart();
        model.addAttribute(cart);
        return "cartList";
    }

    /**
     * 添加商品到购物车
     *         redirectAttributes.addFlashAttribute() 将数据放在session里面可以在页面取出，但是只能取一次
     *         redirectAttributes.addAttribute("skuId", skuId) 将数据放在url后面拼接成参数
     *
     * @return
     */
    @GetMapping("/addToCart")
    public String addToCart(@RequestParam("skuId") Long skuId, @RequestParam("num") Integer num, RedirectAttributes redirectAttributes) throws ExecutionException, InterruptedException {
        cartService.addToCart(skuId, num);
        redirectAttributes.addAttribute("skuId", skuId);

        return "redirect:http://cart.gulimall.com/addToCartSuccess.html";
    }

    @GetMapping("/addToCartSuccess.html")
    public String addToCartSuccessPage(@RequestParam("skuId") Long skuId, Model model) {
        //重定向到成功页面，再次查询购物车数据
        CartItem cartItem = cartService.getCartItem(skuId);
        model.addAttribute("item", cartItem);
        return "success";
    }


    @GetMapping("/checkItem")
    public String checkItem(@RequestParam("skuId") Long skuId, @RequestParam("check") Integer check) {
        cartService.checkItem(skuId, check);
        return "redirect:http://cart.gulimall.com/cart.html";
    }
    
    @GetMapping("/countItem")
    public String countItem(@RequestParam("skuId") Long skuId, @RequestParam("num") Integer num) {
        cartService.changeItemCount(skuId, num);
        return "redirect:http://cart.gulimall.com/cart.html";
    }

    @GetMapping("/deleteItem")
    public String deleteItem(@RequestParam("skuId") Long skuId) {
        cartService.deleteItem(skuId);
        return "redirect:http://cart.gulimall.com/cart.html";
    }
    
    @GetMapping("/currentUserCartItems")
    @ResponseBody
    public List<CartItem> currentUserCartItems() {
        
        return cartService.getUserCartItems();
    }

}
